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Solar activity report
Report of Solar-Geophysical Activity 2024 Aug 20 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 233 Issued at 2200Z on 20 Aug 2024IA. Analysis of Solar Active Regions and Activity from 19-2100Z to 20-2100Z Solar activity has been at moderate levels for the past 24
hours. The largest solar event of the period was a M3 event observed at
19/2152Z from Region 3796 (S03E55). There are currently 11 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be moderate
with a slight chance for an X-class flare on days one, two, and three
(21 Aug, 22 Aug, 23 Aug).
IIA. Geophysical Activity Summary 19-2100Z to 20-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 404 km/s at 19/2239Z. Total IMF reached 7
nT at 19/2159Z. The maximum southward component of Bz reached -6 nT at
19/2117Z.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet levels on day one (21 Aug), quiet to active levels on day
two (22 Aug) and quiet to unsettled levels on day three (23 Aug).
Protons have a slight chance of crossing threshold on days one, two, and
three (21 Aug, 22 Aug, 23 Aug).
III. Event Probabilities 21 Aug to 23 Aug
| Class M | 65% | 65% | 65% |
| Class X | 20% | 20% | 20% |
| Proton | 10% | 10% | 10% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 20 Aug 244 Predicted 21 Aug-23 Aug 245/240/240 90 Day Mean 20 Aug 204
V. Geomagnetic A Indices
Observed Afr/Ap 19 Aug 011/010 Estimated Afr/Ap 20 Aug 007/007 Predicted Afr/Ap 21 Aug-23 Aug 006/005-011/012-008/008
VI. Geomagnetic Activity Probabilities 21 Aug to 23 Aug
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 30% | 15% |
| Minor storm | 01% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 20% | 30% | 25% |
| Major-severe storm | 15% | 40% | 25% |
All times in UTC
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Space weather facts
| Last X-flare | 2024/12/08 | X2.2 |
| Last M-flare | 2024/12/22 | M1.0 |
| Last geomagnetic storm | 2024/12/17 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| November 2024 | 152.5 -13.9 |
| December 2024 | 103.3 -49.2 |
| Last 30 days | 115.4 -40.8 |